Consumer Confidence Report
2026 Water Quality Report
Covering every test from January 1 to December 31, 2025. Published June 26, 2026; the Safe Drinking Water Act asks for it each year by July 1.
Summary
- Water system
- Tarrowby Water District, system ID 5500127
- Source
- Kell Reservoir, surface water
- Treatment
- Coagulation, filtration, chlorine disinfection, fluoride
- Samples taken
- 1,280 in 2025
- Violations
- None
- Questions
- (555) 010-0147, Water Quality Lab
Información en español
Este informe contiene información importante sobre su agua potable. Para recibir una copia en español, llame al (555) 010-0140.
Regulated substances
| Substance | Unit | Limit (MCL) | Goal (MCLG) | Highest level | Range | Violation | Where it comes from |
|---|---|---|---|---|---|---|---|
| Nitrate | ppm | 10 | 10 | 1.4 | 0.6 to 1.4 | No | Runoff from fertilizer use |
| Fluoride | ppm | 4 | 4 | 0.7 | 0.6 to 0.8 | No | Added to protect teeth |
| Total trihalomethanes | ppb | 80 | n/a | 38 | 21 to 52 | No | By-product of disinfection |
| Haloacetic acids (HAA5) | ppb | 60 | n/a | 22 | 12 to 31 | No | By-product of disinfection |
| Chlorine | ppm | 4 (MRDL) | 4 (MRDLG) | 1.3 | 0.4 to 2.1 | No | Added to kill germs |
| Turbidity | NTU | TT: 0.3 in 95% of samples, never over 1 | n/a | 0.12 | 100% under 0.3 | No | Soil runoff |
Lead and copper
Tested at 60 homes chosen because they are most likely to have lead, in June and July 2025.
| Substance | Unit | Action level | 90th percentile | Homes over the action level | Where it comes from |
|---|---|---|---|---|---|
| Lead | ppb | 15 | 3.2 | 1 of 60 | Corrosion of household plumbing |
| Copper | ppm | 1.3 | 0.21 | 0 of 60 | Corrosion of household plumbing |
Bacteria
| Test | Samples | Positive | Limit | Violation |
|---|---|---|---|---|
| Total coliform | 720 | 0 | Treatment technique: find and fix the cause of any positive sample | No |
| E. coli | 720 | 0 | Any confirmed positive sample | No |
What the terms mean
MCL, maximum contaminant level: the highest level allowed in drinking water.
MCLG, maximum contaminant level goal: the level below which there is no known or expected risk to health.
MRDL and MRDLG: the same limit and goal for a disinfectant such as chlorine.
Action level: the level that, if exceeded in more than 10 percent of homes tested, requires more treatment or other steps.
TT, treatment technique: a required process to reduce a contaminant. ppm and ppb: parts per million and parts per billion. NTU: a measure of cloudiness.
Important health information
Some people may be more vulnerable to contaminants in drinking water than the general population: people with cancer undergoing chemotherapy, people who have had organ transplants, people with HIV or other immune system disorders, some elderly people and infants. They should ask their health care providers about drinking water.
Lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water comes mainly from service lines and home plumbing. If water has been sitting for several hours, run the cold tap for 30 seconds to two minutes before drinking or cooking. The Safe Drinking Water Hotline is (800) 426-4791.
Have your say
The Board of Directors meets the last Thursday of the month at 6 p.m. in the Board Room, 200 Reservoir Road. Each meeting starts with public comment. See the meeting schedule.